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Rollup merge of #146403 - cyrgani:array-sugg-sorting, r=fee1-dead

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sort array trait implementation suggestions correctly

Fixes rust-lang/rust#135098.
Previously tried in rust-lang/rust#137428.
This commit is contained in:
Jana Dönszelmann
2025-09-13 02:40:44 +02:00
committed by GitHub
parent 147e97ae68 889be7860b
commit 5dd5264d14
3 changed files with 23 additions and 11 deletions
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18
compiler/rustc_trait_selection/src/error_reporting/traits/fulfillment_errors.rs
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@@ -27,8 +27,8 @@ use rustc_middle::ty::print::{
with_forced_trimmed_paths,
};
use rustc_middle::ty::{
self, TraitRef, Ty, TyCtxt, TypeFoldable, TypeFolder, TypeSuperFoldable, TypeVisitableExt,
Upcast,
self, GenericArgKind, TraitRef, Ty, TyCtxt, TypeFoldable, TypeFolder, TypeSuperFoldable,
TypeVisitableExt, Upcast,
};
use rustc_middle::{bug, span_bug};
use rustc_span::{BytePos, DUMMY_SP, STDLIB_STABLE_CRATES, Span, Symbol, sym};
@@ -2316,7 +2316,19 @@ impl<'a, 'tcx> TypeErrCtxt<'a, 'tcx> {
cand
})
.collect();
impl_candidates.sort_by_key(|cand| (cand.similarity, cand.trait_ref.to_string()));
impl_candidates.sort_by_key(|cand| {
// When suggesting array types, sort them by the length of the array, not lexicographically (#135098)
let len = if let GenericArgKind::Type(ty) = cand.trait_ref.args[0].kind()
&& let ty::Array(_, len) = ty.kind()
{
// Deprioritize suggestions for parameterized arrays.
len.try_to_target_usize(self.tcx).unwrap_or(u64::MAX)
} else {
0
};
(cand.similarity, len, cand.trait_ref.to_string())
});
let mut impl_candidates: Vec<_> =
impl_candidates.into_iter().map(|cand| cand.trait_ref).collect();
impl_candidates.dedup();